US20080316724A1 - Universal solder pad - Google Patents
Universal solder pad Download PDFInfo
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- US20080316724A1 US20080316724A1 US12/049,493 US4949308A US2008316724A1 US 20080316724 A1 US20080316724 A1 US 20080316724A1 US 4949308 A US4949308 A US 4949308A US 2008316724 A1 US2008316724 A1 US 2008316724A1
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- pad unit
- pad
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
- H05K1/111—Pads for surface mounting, e.g. lay-out
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/341—Surface mounted components
- H05K3/3431—Leadless components
- H05K3/3442—Leadless components having edge contacts, e.g. leadless chip capacitors, chip carriers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/3452—Solder masks
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0286—Programmable, customizable or modifiable circuits
- H05K1/0295—Programmable, customizable or modifiable circuits adapted for choosing between different types or different locations of mounted components
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09372—Pads and lands
- H05K2201/09381—Shape of non-curved single flat metallic pad, land or exposed part thereof; Shape of electrode of leadless component
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09818—Shape or layout details not covered by a single group of H05K2201/09009 - H05K2201/09809
- H05K2201/099—Coating over pads, e.g. solder resist partly over pads
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09818—Shape or layout details not covered by a single group of H05K2201/09009 - H05K2201/09809
- H05K2201/09954—More mounting possibilities, e.g. on same place of PCB, or by using different sets of edge pads
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
- H05K2201/10621—Components characterised by their electrical contacts
- H05K2201/10636—Leadless chip, e.g. chip capacitor or resistor
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/05—Patterning and lithography; Masks; Details of resist
- H05K2203/0562—Details of resist
- H05K2203/058—Additional resists used for the same purpose but in different areas, i.e. not stacked
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a solder pad, and more particularly to a universal solder pad for use with different-sized SMD components.
- a pin-through-hole technology (PTHT) is employed to mount electronic components onto one side of a printed circuit board through pin-through-hole connections. Since a plurality of through holes corresponding to the pins of the electronic components are drilled in the printed circuit board and the solder joints between the electronic components and the electronic components are very large, the pin-through-hole technology may be applied to the relatively low-density integrated circuits.
- SMT surface mount technology
- the printed circuit board usually has flat solder pads without holes.
- the process of performing the surface mount technology (SMT) principally comprises the following steps. First of all, solder paste is applied to all the solder pads. Then, the surface-mounted devices (SMDs) are precisely placed on the solder pads. The SMDs and the printed circuit board are then heated in a reflow soldering oven in order to minimize thermal stresses when the assemblies cool down after soldering. The printed circuit board then enters a zone where the temperature is high enough to melt the solder paste, thereby bonding the SMDs' pins on the printed circuit board.
- the SMD components may be mounted on both sides of the printed circuit board, the space utilization of the printed circuit board is increased.
- the SMD components are usually made physically small and lightweight, thereby allowing much higher circuit densities.
- Surface mounting lends itself well to a high degree of automation, so that the fabricating cost is reduced.
- the alignment of the SMD components with the corresponding solder pads on the printed circuit board may usually be oblique or shifted if the profiles of the solder pads are improper or the solder paste is not evenly applied.
- a solder paste which exhibits excessive out-gassing during the initial stages of the melting of the solder powder, will also result in tombstone defects.
- the SMD components fail to be well bonded on the corresponding solder pads, the electrical properties of the integrated circuit are deteriorated.
- FIG. 1A is a schematic cross-sectional view illustrating a SMD component bonded on conventional solder pads.
- FIG. 1B is a top view of the resulting structure of FIG. 1A .
- the solder pad 12 has a substantially rectangular profile and arranged on a surface of a circuit board 11 .
- a surface-mounted device (SMD) component 10 for example a passive component such as a stack capacitor, has a first conductive part 101 and a second conductive part 102 .
- the SMD component 10 is bonded on the solder pads 12 via solder paste 13 .
- the width of the solder pad 12 is greater than the width of the SMD component 10 .
- the length direction of the SMD component 10 is consistent with a straight line passing through the centers of the two solder pads 12 . Since no marks or retaining elements are arranged on the solder pads 12 , the alignment of the first conductive part 101 and the second conductive part 102 of the SMD component 10 with respect to the solder pads 12 is usually unsatisfied. For example, the length direction of the SMD component 10 is deviated from the ideal line, as is indicated in the dashed region. Under this circumstance, the electrical properties of the integrated circuit will be deteriorated and the circuit board 11 is not aesthetically pleasing.
- solder paste 13 As known, during the solder paste 13 is liquefied and then cooled, the solder paste 13 exerts small amounts of torque on each side of the SMD component 10 through surface tension and cohesion. If the solder paste 13 is not evenly applied, the differences in cohesion cause more torque on one side that pulls the opposite side up and off the solder pad 12 , as can be seen in FIG. 2 . Therefore, a tombstone defect is resulted and the SMD component 10 is no longer electrically connected to the circuit board 11 .
- solder pads are varied depending on the kinds of the corresponding SMD components. Therefore, the solder pads are not cost-effective.
- Another object of the present invention provide a universal solder pad for minimizing the undesired effects such as oblique alignment, deviation and/or tombstone defects.
- a universal solder pad of a circuit carrier for use with a plurality of SMD components having different sizes.
- Each of the SMD components includes a first conductive part and a second conductive part.
- the universal solder pad includes a first pad unit and a second pad unit.
- the first pad unit is electrically connected to the first conductive part of the SMD component.
- the second pad unit is electrically connected to the second conductive part of the SMD component.
- Each of the first pad unit and the second pad unit includes a main portion and a first extension portion.
- the first extension portion is extended from a first sidewall of the main portion and includes a first border, a second border and a third border.
- the second border and the third border of the first extension portion are parallel with each other for facilitating alignment of the first and second conductive parts of the SMD component with respect to the first pad unit and the second pad unit.
- a solder pad of a circuit carrier for use with a SMD component.
- the SMD component includes a first conductive part and a second conductive part.
- Each of the first pad unit and the second pad unit includes a main portion and a first extension portion.
- the first extension portion is extended from a first sidewall of the main portion and includes a first border, a second border and a third border.
- the second border and the third border of the first extension portion are parallel with each other for facilitating alignment of the first and second conductive parts of the SMD component with respect to the first pad unit and the second pad unit.
- FIG. 1A is a schematic cross-sectional view illustrating a SMD component bonded on conventional solder pads
- FIG. 1B is a top view of the resulting structure of FIG. 1A ;
- FIG. 2 is a schematic view illustrating a tombstone defect of using the conventional solder pads
- FIG. 3 is a schematic view illustrating a universal solder pad according to a first embodiment of the present invention
- FIG. 4 is a schematic view illustrating a variant of the universal solder pad in FIG. 3 ;
- FIG. 5A is a schematic cross-sectional view illustrating a first SMD component mounted on the universal solder pad according to the first embodiment of the present invention
- FIG. 5B is a schematic cross-sectional view illustrating a second SMD component mounted on the universal solder pad according to the first embodiment of the present invention
- FIG. 6 is a schematic view illustrating a universal solder pad according to a second embodiment of the present invention.
- FIG. 7 is a schematic view illustrating a variant of the universal solder pad in FIG. 6 ;
- FIG. 8A is a schematic cross-sectional view illustrating a first SMD component mounted on the universal solder pad according to the second embodiment of the present invention.
- FIG. 8B is a schematic cross-sectional view illustrating a second SMD component mounted on the universal solder pad according to the second embodiment of the present invention.
- FIG. 8C is a schematic cross-sectional view illustrating a third SMD component mounted on the universal solder pad according to the second embodiment of the present invention.
- FIG. 3 a schematic view of a universal solder pad according to a first preferred embodiment of the present invention is illustrated.
- the universal solder pad is arranged on a surface of a circuit carrier 2 .
- An example of the circuit carrier 2 includes but is not limited to a printed circuit board, a printed wiring board or a substrate.
- the universal solder pad of the present invention is applicable to many kinds of SMD components having different size specifications. After the conductive parts of a SMD component (not shown) is bonded on the universal solder pad, the SMD component is electrically connected to the circuit carrier 2 .
- the universal solder pad principally includes a first pad unit 20 and a second pad unit 21 .
- the first pad unit 20 includes a main portion 201 , which has a first sidewall 202 , a second sidewall 203 , a third sidewall 204 and a fifth sidewall 205 .
- the second pad unit 21 includes a main portion 211 , which has a first sidewall 212 , a second sidewall 213 , a third sidewall 214 and a fifth sidewall 215 .
- the first sidewall 202 of the first pad unit 20 is disposed beside the first sidewall 212 of the second pad unit 21 .
- a first extension portion 206 is extended from the middle of the first sidewall 202 of the main portion 201 .
- a first extension portion 216 is extended from the middle of the first sidewall 212 of the main portion 211 .
- the first extension portions 206 and 216 are symmetrical with each other.
- the first extension portion 206 of the first pad unit 20 includes a first border 206 a, a second border 206 b and a third border 206 c.
- the first extension portion 216 of the second pad unit 21 includes a first border 216 a, a second border 216 b and a third border 216 c.
- the first borders 206 a and 216 a face to each other.
- the second borders 206 b, 216 b and the third borders 206 c, 216 c may function as retaining marks for facilitating alignment of the conductive parts of the SMD component (not shown) with respect to the first pad unit 20 and the second pad unit 21 .
- the possibility of causing the oblique alignment is reduced.
- solder paste (not shown) is applied on the main portions 201 , 211 and the first extension portions 206 , 216 and the corresponding conductive parts of the SMD component are placed on the first pad unit 20 and the second pad unit 21 , the second borders 206 b, 216 b and the third borders 206 c, 216 c may hinder the solder paste from overflowing outside the first pad unit 20 and the second pad unit 21 .
- the first pad unit 20 and the second pad unit 21 may optionally include confining portions 207 and 217 , respectively.
- the confining portions 207 and 217 are substantially second extension portions of the first pad unit 20 and the second pad unit 21 .
- the second extension portion (i.e. confining portion) 207 is extended from the middle of the fourth sidewall 205 of the main portion 201 .
- the second extension portion (i.e. confining portion) 217 is extended from the middle of the fourth sidewall 215 of the main portion 211 .
- the length of the confining portion 207 ( 217 ) is smaller than that of the first extension portion 206 ( 216 ).
- two turning portions 208 are formed between the corners of the confining portion 207 and the main portion 201
- two turning portions 218 are formed between the corners of the confining portion 217 and the main portion 211 .
- the turning portions 208 and 218 may hinder the solder paste from overflowing outside the first pad unit 20 and the second pad unit 21 .
- the length, the width and the area of the confining portion 207 ( 217 ) are smaller than those of the main portion 201 ( 211 ).
- the borders of the confining portion 207 and 217 may be naturally formed as a retaining wall for hindering the solder paste from overflowing outside the first pad unit 20 and the second pad unit 21 because the areas of the confining portions 207 , 217 are smaller than the main portions 201 , 211 .
- the profiles of the universal solder pad in FIG. 3 may be formed on the circuit carrier 2 by etching. It is noted that, however, those skilled in the art will readily observe that numerous modifications and alterations of may be made to fabricate the universal solder pad. For example, as shown in FIG. 4 , two rectangular solderable regions 23 and 24 are firstly formed on the circuit carrier 2 , and then non-solderable primer 25 is applied on four corners of the rectangular solderable regions 23 and 24 to define the first pad unit 20 and the second pad unit 21 .
- the universal solder pad of the present invention may be used with different-sized SMD components.
- a first SMD component e.g. a 0603 stack capacitor having a dimension of 0.063′′ ⁇ 0.031′′
- a second SMD component e.g. a 0805 stack capacitor having a dimension of 0.08′′ ⁇ 0.05′′
- FIG. 5A is a schematic cross-sectional view illustrating the first SMD component mounted on the universal solder pad according to the first embodiment of the present invention.
- the first conductive part 271 and the second conductive part 272 of the first SMD component 27 are attached on the first pad unit 20 and the second pad unit 21 via the solder paste 26 .
- the second borders 206 b 216 b and the third borders 206 c, 216 c may function as retaining marks for facilitating alignment of the first conductive part 271 and the second conductive part 272 of the first SMD component 27 with respect to the first pad unit 20 and the second pad unit 21 . As a consequence, the possibility of causing the oblique alignment is reduced.
- the second borders 206 a, 216 a and the third borders 206 c, 216 c may hinder the solder paste 26 from overflowing outside the first pad unit 20 and the second pad unit 21 .
- the turning portions 208 and 218 may also function as retaining walls for hindering the solder paste from overflowing outside the first pad unit 20 and the second pad unit 21 .
- FIG. 5B is a schematic cross-sectional view illustrating the second SMD component mounted on the universal solder pad according to the first embodiment of the present invention.
- the first conductive part 281 and the second conductive part 282 of the second SMD component 28 are attached on the first pad unit 20 and the second pad unit 21 via the solder paste 26 .
- the second borders 206 b 216 b and the third borders 206 c, 216 c may function as retaining marks for facilitating alignment of the first conductive part 281 and the second conductive part 282 of the second SMD component 28 with respect to the first pad unit 20 and the second pad unit 21 .
- the second sidewall 203 ( 213 ) and the third sidewall 204 ( 214 ) of the main portion 201 ( 211 ) may also function as retaining marks at this circumstance.
- the first conductive part 281 and the second conductive part 282 of the second SMD component 28 are mounted on the main portions 201 , 211 and partially the confining portions 207 , 217 . Since the areas of the confining portions 207 , 217 are smaller than the main portions 201 , 211 , the borders of the confining portion 207 and 217 may be naturally formed as a retaining wall for hindering the solder paste from overflowing outside the first pad unit 20 and the second pad unit 21 . By means of the universal solder pad of the present invention, the oblique alignment and the tombstone defects are minimized.
- FIG. 6 a schematic view of a universal solder pad according to a second preferred embodiment of the present invention is illustrated.
- the elements corresponding to those in FIG. 3 will be designated by identical numeral references.
- the first extension portions 206 and 216 included therein are similar to those shown in FIG. 3 , and are not redundantly described herein.
- the first pad unit 20 and the second pad unit 21 include confining portions 209 and 219 , which are formed on the main portions 201 and 211 , respectively.
- the confining portions 209 and 219 are elongated strips, which are made of non-solderable primer.
- the confining portions 209 and 219 are substantially parallel with the first borders 206 a, 216 a of the first extension portions 206 , 216 and distant from the first sidewalls 202 , 212 of the main portions 201 , 211 .
- the profiles of the universal solder pad in FIG. 6 may be formed on the circuit carrier 2 by etching.
- the confining portions 209 and 219 are applied on the main portions 201 , 211 by using a photo mask. It is noted that, however, those skilled in the art will readily observe that numerous modifications and alterations of may be made to fabricate the universal solder pad. For example, as shown in FIG. 7 , two rectangular solderable regions 23 and 24 are firstly formed on the circuit carrier 2 , and then non-solderable primer 25 is applied on two corners of the rectangular solderable regions 23 and 24 to define the first pad unit 20 and the second pad unit 21 . Likewise, the confining portions 209 and 219 are applied on the main portions 201 , 211 by using a photo mask.
- the universal solder pad of the present invention may be used with different-sized SMD components.
- a first SMD component e.g. a 0805 stack capacitor having a dimension of 0.08′′ ⁇ 0.05′′
- a second SMD component e.g. a 1206 stack capacitor having a dimension of 0.126′′ ⁇ 0.063′′
- a third SMD component e.g. a 1210 stack capacitor having a dimension of 0.126′′ ⁇ 0.100′′
- FIG. 8A is a schematic cross-sectional view illustrating the first SMD component mounted on the universal solder pad according to the second embodiment of the present invention.
- the first conductive part 271 and the second conductive part 272 of the first SMD component 27 are attached on the first pad unit 20 and the second pad unit 21 via the solder paste 26 .
- the second borders 206 b 216 b and the third borders 206 c, 216 c may function as retaining marks for facilitating alignment of the first conductive part 271 and the second conductive part 272 of the first SMD component 27 with respect to the first pad unit 20 and the second pad unit 21 . As a consequence, the possibility of causing the oblique alignment is reduced.
- the second borders 206 a, 216 a and the third borders 206 c, 216 c may hinder the solder paste 26 from overflowing outside the first pad unit 20 and the second pad unit 21 .
- the confining portions 209 and 219 are close to the first conductive part 271 and the second conductive part 272 of the first SMD component 27 , the confining portions 209 and 219 may function as retaining walls for hindering the solder paste 26 from overflowing outside the first pad unit 20 and the second pad unit 21 .
- FIG. 8B is a schematic cross-sectional view illustrating the second SMD component mounted on the universal solder pad according to the second embodiment of the present invention.
- the first conductive part 281 and the second conductive part 282 of the second SMD component 28 are attached on the first pad unit 20 and the second pad unit 21 via the solder paste 26 .
- the second borders 206 b 216 b and the third borders 206 c, 216 c may function as retaining marks for facilitating alignment of the first conductive part 281 and the second conductive part 282 of the second SMD component 28 with respect to the first pad unit 20 and the second pad unit 21 .
- the second sidewall 203 ( 213 ) and the third sidewall 204 ( 214 ) of the main portion 201 ( 211 ) may also function as retaining marks at this circumstance.
- the first conductive part 281 and the second conductive part 282 of the second SMD component 28 are partially or fully cover the confining portions 209 , 219 , the friction between the conductive part 281 ( 282 ) and the confining portion 209 ( 219 ) is increased. As a consequence, the deviation of the second SMD component 28 is reduced.
- the borders of the main portions 201 , 211 may be naturally formed as a retaining wall for hindering the solder paste 26 from overflowing outside the first pad unit 20 and the second pad unit 21 .
- FIG. 8C is a schematic cross-sectional view illustrating the third SMD component mounted on the universal solder pad according to the second embodiment of the present invention.
- the first conductive part 291 and the second conductive part 292 of the third SMD component 29 are attached on the first pad unit 20 and the second pad unit 21 via the solder paste 26 .
- the second borders 206 b 216 b and the third borders 206 c, 216 c may function as retaining marks for facilitating alignment of the first conductive part 291 and the second conductive part 292 of the third SMD component 29 with respect to the first pad unit 20 and the second pad unit 21 .
- the second sidewall 203 ( 213 ) and the third sidewall 204 ( 214 ) of the main portion 201 ( 211 ) may also function as retaining marks at this circumstance.
- the first conductive part 291 and the second conductive part 292 of the third SMD component 29 are partially or fully cover the confining portions 209 , 219 , the friction between the conductive part 281 ( 282 ) and the confining portion 209 ( 219 ) is increased. As a consequence, the deviation of the third SMD component 29 is reduced.
- the borders of the main portions 201 , 211 may be naturally formed as a retaining wall for hindering the solder paste 26 from overflowing outside the first pad unit 20 and the second pad unit 21 .
- the universal solder pad of the present invention is applicable to different-sized SMD components, thereby enhancing cost-effectiveness.
- the undesired effects such as oblique alignment, deviation and/or tombstone defects are minimized.
Abstract
Description
- The present invention relates to a solder pad, and more particularly to a universal solder pad for use with different-sized SMD components.
- Conventionally, a pin-through-hole technology (PTHT) is employed to mount electronic components onto one side of a printed circuit board through pin-through-hole connections. Since a plurality of through holes corresponding to the pins of the electronic components are drilled in the printed circuit board and the solder joints between the electronic components and the electronic components are very large, the pin-through-hole technology may be applied to the relatively low-density integrated circuits.
- With increasing progress of fabricating integrated circuits, the semiconductor packages are developed toward minimization and high integration. As a consequence, the requirement of increasing the pin density of the semiconductor packages becomes more important. Recently, a surface mount technology (SMT) is gradually used to constructing relatively high-density integrated circuits. The printed circuit board usually has flat solder pads without holes. Generally, the process of performing the surface mount technology (SMT) principally comprises the following steps. First of all, solder paste is applied to all the solder pads. Then, the surface-mounted devices (SMDs) are precisely placed on the solder pads. The SMDs and the printed circuit board are then heated in a reflow soldering oven in order to minimize thermal stresses when the assemblies cool down after soldering. The printed circuit board then enters a zone where the temperature is high enough to melt the solder paste, thereby bonding the SMDs' pins on the printed circuit board.
- Since the SMD components may be mounted on both sides of the printed circuit board, the space utilization of the printed circuit board is increased. In addition, the SMD components are usually made physically small and lightweight, thereby allowing much higher circuit densities. Surface mounting lends itself well to a high degree of automation, so that the fabricating cost is reduced.
- Due to the very small size and spacing of the SMD components, there are also some drawbacks. For example, the alignment of the SMD components with the corresponding solder pads on the printed circuit board may usually be oblique or shifted if the profiles of the solder pads are improper or the solder paste is not evenly applied. In addition, a solder paste, which exhibits excessive out-gassing during the initial stages of the melting of the solder powder, will also result in tombstone defects. In a case that the SMD components fail to be well bonded on the corresponding solder pads, the electrical properties of the integrated circuit are deteriorated.
-
FIG. 1A is a schematic cross-sectional view illustrating a SMD component bonded on conventional solder pads.FIG. 1B is a top view of the resulting structure ofFIG. 1A . As shown inFIGS. 1A and 1B , thesolder pad 12 has a substantially rectangular profile and arranged on a surface of acircuit board 11. A surface-mounted device (SMD)component 10, for example a passive component such as a stack capacitor, has a firstconductive part 101 and a secondconductive part 102. TheSMD component 10 is bonded on thesolder pads 12 viasolder paste 13. Generally, the width of thesolder pad 12 is greater than the width of theSMD component 10. Ideally, the length direction of theSMD component 10 is consistent with a straight line passing through the centers of the twosolder pads 12. Since no marks or retaining elements are arranged on thesolder pads 12, the alignment of the firstconductive part 101 and the secondconductive part 102 of theSMD component 10 with respect to thesolder pads 12 is usually unsatisfied. For example, the length direction of theSMD component 10 is deviated from the ideal line, as is indicated in the dashed region. Under this circumstance, the electrical properties of the integrated circuit will be deteriorated and thecircuit board 11 is not aesthetically pleasing. - As known, during the
solder paste 13 is liquefied and then cooled, thesolder paste 13 exerts small amounts of torque on each side of theSMD component 10 through surface tension and cohesion. If thesolder paste 13 is not evenly applied, the differences in cohesion cause more torque on one side that pulls the opposite side up and off thesolder pad 12, as can be seen inFIG. 2 . Therefore, a tombstone defect is resulted and theSMD component 10 is no longer electrically connected to thecircuit board 11. - Since electronic products become more diverse, the electronic components used in these electronic products have a variety of specifications. In other words, the specifications of the solder pads are varied depending on the kinds of the corresponding SMD components. Therefore, the solder pads are not cost-effective.
- In views of the above-described disadvantages resulted from the conventional method, the applicant keeps on carving unflaggingly to develop a universal solder pad according to the present invention through wholehearted experience and research
- It is an object of the present invention to provide a universal solder pad for use with different-sized SMD components so as to enhance cost effectiveness.
- Another object of the present invention provide a universal solder pad for minimizing the undesired effects such as oblique alignment, deviation and/or tombstone defects.
- In accordance with an aspect of the present invention, there is provided a universal solder pad of a circuit carrier for use with a plurality of SMD components having different sizes. Each of the SMD components includes a first conductive part and a second conductive part. The universal solder pad includes a first pad unit and a second pad unit. The first pad unit is electrically connected to the first conductive part of the SMD component. The second pad unit is electrically connected to the second conductive part of the SMD component. Each of the first pad unit and the second pad unit includes a main portion and a first extension portion. The first extension portion is extended from a first sidewall of the main portion and includes a first border, a second border and a third border. The second border and the third border of the first extension portion are parallel with each other for facilitating alignment of the first and second conductive parts of the SMD component with respect to the first pad unit and the second pad unit.
- In accordance with another aspect of the present invention, there is provided a solder pad of a circuit carrier for use with a SMD component. The SMD component includes a first conductive part and a second conductive part. Each of the first pad unit and the second pad unit includes a main portion and a first extension portion. The first extension portion is extended from a first sidewall of the main portion and includes a first border, a second border and a third border. The second border and the third border of the first extension portion are parallel with each other for facilitating alignment of the first and second conductive parts of the SMD component with respect to the first pad unit and the second pad unit.
- The above contents of the present invention will become more readily apparent to those ordinarily skilled in the art after reviewing the following detailed description and accompanying drawings, in which:
-
FIG. 1A is a schematic cross-sectional view illustrating a SMD component bonded on conventional solder pads; -
FIG. 1B is a top view of the resulting structure ofFIG. 1A ; -
FIG. 2 is a schematic view illustrating a tombstone defect of using the conventional solder pads; -
FIG. 3 is a schematic view illustrating a universal solder pad according to a first embodiment of the present invention; -
FIG. 4 is a schematic view illustrating a variant of the universal solder pad inFIG. 3 ; -
FIG. 5A is a schematic cross-sectional view illustrating a first SMD component mounted on the universal solder pad according to the first embodiment of the present invention; -
FIG. 5B is a schematic cross-sectional view illustrating a second SMD component mounted on the universal solder pad according to the first embodiment of the present invention; -
FIG. 6 is a schematic view illustrating a universal solder pad according to a second embodiment of the present invention; -
FIG. 7 is a schematic view illustrating a variant of the universal solder pad inFIG. 6 ; -
FIG. 8A is a schematic cross-sectional view illustrating a first SMD component mounted on the universal solder pad according to the second embodiment of the present invention; -
FIG. 8B is a schematic cross-sectional view illustrating a second SMD component mounted on the universal solder pad according to the second embodiment of the present invention; and -
FIG. 8C is a schematic cross-sectional view illustrating a third SMD component mounted on the universal solder pad according to the second embodiment of the present invention. - The present invention will now be described more specifically with reference to the following embodiments. It is to be noted that the following descriptions of preferred embodiments of this invention are presented herein for purpose of illustration and description only. It is not intended to be exhaustive or to be limited to the precise form disclosed.
- Referring to
FIG. 3 , a schematic view of a universal solder pad according to a first preferred embodiment of the present invention is illustrated. The universal solder pad is arranged on a surface of acircuit carrier 2. An example of thecircuit carrier 2 includes but is not limited to a printed circuit board, a printed wiring board or a substrate. The universal solder pad of the present invention is applicable to many kinds of SMD components having different size specifications. After the conductive parts of a SMD component (not shown) is bonded on the universal solder pad, the SMD component is electrically connected to thecircuit carrier 2. - As shown in
FIG. 3 , the universal solder pad principally includes afirst pad unit 20 and asecond pad unit 21. Thefirst pad unit 20 includes amain portion 201, which has afirst sidewall 202, asecond sidewall 203, athird sidewall 204 and afifth sidewall 205. Thesecond pad unit 21 includes amain portion 211, which has afirst sidewall 212, asecond sidewall 213, athird sidewall 214 and afifth sidewall 215. Thefirst sidewall 202 of thefirst pad unit 20 is disposed beside thefirst sidewall 212 of thesecond pad unit 21. Afirst extension portion 206 is extended from the middle of thefirst sidewall 202 of themain portion 201. Likewise, afirst extension portion 216 is extended from the middle of thefirst sidewall 212 of themain portion 211. Thefirst extension portions - In some embodiments, the
first extension portion 206 of thefirst pad unit 20 includes afirst border 206 a, asecond border 206 b and athird border 206 c. Likewise, thefirst extension portion 216 of thesecond pad unit 21 includes afirst border 216 a, asecond border 216 b and athird border 216 c. Thefirst borders second border 206 b is parallel with thethird border 206 c and thesecond border 216 b is parallel with thethird border 216 c, thesecond borders third borders first pad unit 20 and thesecond pad unit 21. As a consequence, the possibility of causing the oblique alignment is reduced. In addition, after solder paste (not shown) is applied on themain portions first extension portions first pad unit 20 and thesecond pad unit 21, thesecond borders third borders first pad unit 20 and thesecond pad unit 21. - For further reducing the oblique alignment and thus the tombstone defects, the
first pad unit 20 and thesecond pad unit 21 may optionally include confiningportions portions first pad unit 20 and thesecond pad unit 21. The second extension portion (i.e. confining portion) 207 is extended from the middle of thefourth sidewall 205 of themain portion 201. Likewise, the second extension portion (i.e. confining portion) 217 is extended from the middle of thefourth sidewall 215 of themain portion 211. In this embodiment, the length of the confining portion 207 (217) is smaller than that of the first extension portion 206 (216). More especially, two turningportions 208 are formed between the corners of the confiningportion 207 and themain portion 201, and two turningportions 218 are formed between the corners of the confiningportion 217 and themain portion 211. The turningportions first pad unit 20 and thesecond pad unit 21. - In some embodiments, the length, the width and the area of the confining portion 207 (217) are smaller than those of the main portion 201 (211). In a case that the conductive parts of a SMD component are mounted on the
main portions portions portion first pad unit 20 and thesecond pad unit 21 because the areas of the confiningportions main portions - The profiles of the universal solder pad in
FIG. 3 may be formed on thecircuit carrier 2 by etching. It is noted that, however, those skilled in the art will readily observe that numerous modifications and alterations of may be made to fabricate the universal solder pad. For example, as shown inFIG. 4 , two rectangularsolderable regions circuit carrier 2, and thennon-solderable primer 25 is applied on four corners of the rectangularsolderable regions first pad unit 20 and thesecond pad unit 21. - The universal solder pad of the present invention may be used with different-sized SMD components. Hereinafter, a first SMD component (e.g. a 0603 stack capacitor having a dimension of 0.063″×0.031″) and a second SMD component (e.g. a 0805 stack capacitor having a dimension of 0.08″×0.05″) are illustrated for example with reference to
FIG. 5 . - Please refer to
FIG. 5A , which is a schematic cross-sectional view illustrating the first SMD component mounted on the universal solder pad according to the first embodiment of the present invention. As shown inFIG. 5A , the firstconductive part 271 and the secondconductive part 272 of thefirst SMD component 27 are attached on thefirst pad unit 20 and thesecond pad unit 21 via thesolder paste 26. Since the width of the conductive part 271 (272) is smaller than thefirst border 206 a (216 a) of the first extension portion 206 (216) and thesecond border 206 b (216 b) is parallel with thethird border 206 c (216 c), thesecond borders 206 b 216 b and thethird borders conductive part 271 and the secondconductive part 272 of thefirst SMD component 27 with respect to thefirst pad unit 20 and thesecond pad unit 21. As a consequence, the possibility of causing the oblique alignment is reduced. In addition, thesecond borders third borders solder paste 26 from overflowing outside thefirst pad unit 20 and thesecond pad unit 21. Similarly, the turningportions first pad unit 20 and thesecond pad unit 21. By means of the universal solder pad of the present invention, the oblique alignment and the tombstone defects are minimized. - Please refer to
FIG. 5B , which is a schematic cross-sectional view illustrating the second SMD component mounted on the universal solder pad according to the first embodiment of the present invention. As shown inFIG. 5B , the firstconductive part 281 and the secondconductive part 282 of thesecond SMD component 28 are attached on thefirst pad unit 20 and thesecond pad unit 21 via thesolder paste 26. Since the width of the conductive part 281 (282) is greater than thefirst border 206 a (216 a) of the first extension portion 206 (216) and thesecond border 206 b (216 b) is parallel with thethird border 206 c (216 c), thesecond borders 206 b 216 b and thethird borders conductive part 281 and the secondconductive part 282 of thesecond SMD component 28 with respect to thefirst pad unit 20 and thesecond pad unit 21. Moreover, the second sidewall 203 (213) and the third sidewall 204 (214) of the main portion 201 (211) may also function as retaining marks at this circumstance. In addition, the firstconductive part 281 and the secondconductive part 282 of thesecond SMD component 28 are mounted on themain portions portions portions main portions portion first pad unit 20 and thesecond pad unit 21. By means of the universal solder pad of the present invention, the oblique alignment and the tombstone defects are minimized. - Referring to
FIG. 6 , a schematic view of a universal solder pad according to a second preferred embodiment of the present invention is illustrated. As shown inFIG. 6 , the elements corresponding to those inFIG. 3 will be designated by identical numeral references. In this embodiment, thefirst extension portions FIG. 3 , and are not redundantly described herein. Whereas, thefirst pad unit 20 and thesecond pad unit 21 include confiningportions main portions portions portions first borders first extension portions first sidewalls main portions - The profiles of the universal solder pad in
FIG. 6 may be formed on thecircuit carrier 2 by etching. The confiningportions main portions FIG. 7 , two rectangularsolderable regions circuit carrier 2, and thennon-solderable primer 25 is applied on two corners of the rectangularsolderable regions first pad unit 20 and thesecond pad unit 21. Likewise, the confiningportions main portions - The universal solder pad of the present invention may be used with different-sized SMD components. Hereinafter, a first SMD component (e.g. a 0805 stack capacitor having a dimension of 0.08″×0.05″), a second SMD component (e.g. a 1206 stack capacitor having a dimension of 0.126″×0.063″) and a third SMD component (e.g. a 1210 stack capacitor having a dimension of 0.126″×0.100″) are illustrated for example with reference to
FIG. 8 . - Please refer to
FIG. 8A , which is a schematic cross-sectional view illustrating the first SMD component mounted on the universal solder pad according to the second embodiment of the present invention. As shown inFIG. 8A , the firstconductive part 271 and the secondconductive part 272 of thefirst SMD component 27 are attached on thefirst pad unit 20 and thesecond pad unit 21 via thesolder paste 26. Since the width of the conductive part 271 (272) is smaller than thefirst border 206 a (216 a) of the first extension portion 206 (216) and thesecond border 206 b (216 b) is parallel with thethird border 206 c (216 c), thesecond borders 206 b 216 b and thethird borders conductive part 271 and the secondconductive part 272 of thefirst SMD component 27 with respect to thefirst pad unit 20 and thesecond pad unit 21. As a consequence, the possibility of causing the oblique alignment is reduced. In addition, thesecond borders third borders solder paste 26 from overflowing outside thefirst pad unit 20 and thesecond pad unit 21. Moreover, since the confiningportions conductive part 271 and the secondconductive part 272 of thefirst SMD component 27, the confiningportions solder paste 26 from overflowing outside thefirst pad unit 20 and thesecond pad unit 21. By means of the universal solder pad of the present invention, the oblique alignment and the tombstone defects are minimized. - Please refer to
FIG. 8B , which is a schematic cross-sectional view illustrating the second SMD component mounted on the universal solder pad according to the second embodiment of the present invention. As shown inFIG. 8B , the firstconductive part 281 and the secondconductive part 282 of thesecond SMD component 28 are attached on thefirst pad unit 20 and thesecond pad unit 21 via thesolder paste 26. Since the width of the conductive part 281 (282) is greater than thefirst border 206 a (216 a) of the first extension portion 206 (216) and thesecond border 206 b (216 b) is parallel with thethird border 206 c (216 c), thesecond borders 206 b 216 b and thethird borders conductive part 281 and the secondconductive part 282 of thesecond SMD component 28 with respect to thefirst pad unit 20 and thesecond pad unit 21. Moreover, the second sidewall 203 (213) and the third sidewall 204 (214) of the main portion 201 (211) may also function as retaining marks at this circumstance. In addition, since the firstconductive part 281 and the secondconductive part 282 of thesecond SMD component 28 are partially or fully cover the confiningportions second SMD component 28 is reduced. Moreover, the borders of themain portions solder paste 26 from overflowing outside thefirst pad unit 20 and thesecond pad unit 21. By means of the universal solder pad of the present invention, the oblique alignment and the tombstone defects are minimized. - Please refer to
FIG. 8C , which is a schematic cross-sectional view illustrating the third SMD component mounted on the universal solder pad according to the second embodiment of the present invention. As shown inFIG. 8C , the firstconductive part 291 and the secondconductive part 292 of thethird SMD component 29 are attached on thefirst pad unit 20 and thesecond pad unit 21 via thesolder paste 26. Since the width of the conductive part 291 (282) is greater than thefirst border 206 a (216 a) of the first extension portion 206 (216) and thesecond border 206 b (216 b) is parallel with thethird border 206 c (216 c), thesecond borders 206 b 216 b and thethird borders conductive part 291 and the secondconductive part 292 of thethird SMD component 29 with respect to thefirst pad unit 20 and thesecond pad unit 21. Moreover, the second sidewall 203 (213) and the third sidewall 204 (214) of the main portion 201 (211) may also function as retaining marks at this circumstance. In addition, since the firstconductive part 291 and the secondconductive part 292 of thethird SMD component 29 are partially or fully cover the confiningportions third SMD component 29 is reduced. Moreover, the borders of themain portions solder paste 26 from overflowing outside thefirst pad unit 20 and thesecond pad unit 21. By means of the universal solder pad of the present invention, the oblique alignment and the tombstone defects are minimized. - From the above description, it is found that the universal solder pad of the present invention is applicable to different-sized SMD components, thereby enhancing cost-effectiveness. By using the universal solder pad of the present invention, the undesired effects such as oblique alignment, deviation and/or tombstone defects are minimized.
- While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.
Claims (18)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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TW096122647 | 2007-06-22 | ||
TW096122647A TWI337055B (en) | 2007-06-22 | 2007-06-22 | Universal solder pad structure |
TW96122647A | 2007-06-22 |
Publications (2)
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US20080316724A1 true US20080316724A1 (en) | 2008-12-25 |
US7916495B2 US7916495B2 (en) | 2011-03-29 |
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US12/049,493 Expired - Fee Related US7916495B2 (en) | 2007-06-22 | 2008-03-17 | Universal solder pad |
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TW (1) | TWI337055B (en) |
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WO2013179288A1 (en) * | 2012-05-29 | 2013-12-05 | Essence Solar Solutions Ltd. | Self aligning soldering |
US20130335933A1 (en) * | 2012-06-15 | 2013-12-19 | Kabushiki Kaisha Toshiba | Circuit board and electronic device |
US20140029223A1 (en) * | 2012-07-25 | 2014-01-30 | Nisho Image Tech Inc. | Circuit board with reduced adhesive overflow and circuit structure thereof |
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WO2016014357A1 (en) * | 2014-07-22 | 2016-01-28 | Cree, Inc. | Solder pads, methods, and systems for circuitry components |
JP2016219510A (en) * | 2015-05-15 | 2016-12-22 | 三菱電機株式会社 | Printed wiring board, printed substrate, printed wiring board manufacturing method, printed substrate manufacturing method |
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US8664541B2 (en) * | 2011-07-25 | 2014-03-04 | International Business Machines Corporation | Modified 0402 footprint for a printed circuit board (‘PCB’) |
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US20160374204A1 (en) * | 2015-06-18 | 2016-12-22 | Kabushiki Kaisha Toshiba | Circuit board, electronic apparatus comprising circuit board, and method for soldering components |
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WO2013179288A1 (en) * | 2012-05-29 | 2013-12-05 | Essence Solar Solutions Ltd. | Self aligning soldering |
US8900911B2 (en) | 2012-05-29 | 2014-12-02 | Essence Solar Solutions Ltd. | Frame holder |
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US20130335933A1 (en) * | 2012-06-15 | 2013-12-19 | Kabushiki Kaisha Toshiba | Circuit board and electronic device |
US20140029223A1 (en) * | 2012-07-25 | 2014-01-30 | Nisho Image Tech Inc. | Circuit board with reduced adhesive overflow and circuit structure thereof |
WO2016014357A1 (en) * | 2014-07-22 | 2016-01-28 | Cree, Inc. | Solder pads, methods, and systems for circuitry components |
EP3196949A4 (en) * | 2014-07-31 | 2018-01-24 | CCS Inc. | Led mounting substrate and led |
JP2016219510A (en) * | 2015-05-15 | 2016-12-22 | 三菱電機株式会社 | Printed wiring board, printed substrate, printed wiring board manufacturing method, printed substrate manufacturing method |
CN105208792A (en) * | 2015-08-07 | 2015-12-30 | 深圳崇达多层线路板有限公司 | PCB manufacturing method for preventing tombstoning effect |
JP2019176071A (en) * | 2018-03-29 | 2019-10-10 | パナソニックIpマネジメント株式会社 | Manufacturing method of light source module, light source module and mobile |
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FR3099641A1 (en) * | 2019-07-31 | 2021-02-05 | Valeo Vision | Electronic assembly, device and method for automotive lighting |
Also Published As
Publication number | Publication date |
---|---|
TWI337055B (en) | 2011-02-01 |
TW200901843A (en) | 2009-01-01 |
US7916495B2 (en) | 2011-03-29 |
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